LTC4267 - Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator

The current mode switching regulator is designed for driving a 6V rated N-channel MOSFET and features programmable slope compensation, soft-start, and constant frequency operation, minimizing noise even with light loads. The LTC4267 includes an onboard error ampliﬁer and voltage reference allowing use in both isolated and nonisolated conﬁgurations.

The LTC4267 is available in space saving, low proﬁle 16-pin SSOP or DFN packages.

Features

Complete Power Interface Port for IEEE 802.3af Powered Device (PD)
Onboard 100V, 400mA UVLO Switch
Precision Dual Level Inrush Current Limit
Integrated Current Mode Switching Regulator
Onboard 25kΩ Signature Resistor with Disable
Programmable Classiﬁcation Current (Class 0-4)
Thermal Overload Protection
Power Good Signal
Integrated Error Ampliﬁer and Voltage Reference
Low Proﬁle 16-Pin SSOP and 3mm × 5mm DFN Packages

Typical Application

Applications

IP Phone Power Management
Wireless Access Points
Security Cameras
Power over Ethernet

Packaging

Order Information

Part Number	Package	Temp	Price(1-99)	Price (1k)*
LTC4267CDHC#PBF	5x3 DFN-16	C	$2.92	$2.20
LTC4267CDHC#TRPBF	5x3 DFN-16	C		$2.30
LTC4267CGN#PBF	SSOP-16	C	$2.75	$2.10
LTC4267CGN#TRPBF	SSOP-16	C		$2.16
LTC4267IDHC#PBF	5x3 DFN-16	I	$3.50	$2.65
LTC4267IDHC#TRPBF	5x3 DFN-16	I		$2.75
LTC4267IGN#PBF	SSOP-16	I	$3.33	$2.55
LTC4267IGN#TRPBF	SSOP-16	I		$2.61

Demo Boards

Part Number	Description	Price
DC1145B	LTC4267CDHC \| PoE Powered Device w/12V Isolated Auxiliary, Vout = 12V @ 0.9A	$75.00
DC804B-A	LTC4267CDHC \| RJ-45 Ethernet Output, Vout = 3.3V @ 1.0A	$75.00
DC859A	LTC4267IDHC Triple-Output PD for PoE	$75.00
DC917A	LTC4267\| PoE to 3.3V@2.6A Isolated	$75.00